80 • Programmable Field Bus Controller 750-833
Configuration
WAGO-I/O-SYSTEM
750
Bus System
Structure of the length bytes:
Bit
Meaning
7
6
5
4
3
2
1
0
0
...
1
0
...
1
0
...
1
0
...
1
1
...
1
0
...
1
Data length
1 byte or word
...
63 bytes or 63 words
0
1
Format
0 = byte structure
1 = word structure
0
1
Consistency about
Byte or word
Total length
Since the adoption of the DP/V1 specification, it is possible to add data type
information to the process data that is described via the special identification
byte. This is done using the manufacturer specific data.
Structure of the identification:
Octet 1
Bit
Meaning
7
6
5
4
3
2
1
0
0
0
...
1
1
0
0
...
1
1
0
0
...
1
1
0
1
...
0
1
Length of the manufacturer specific data
0 = no manufacturer specific data
1 ... 14 = length of the manufacturer specific data
15 = no manufacturer specific data follows
0
0
Input and output
Spec. identification formats
0
0
1
1
0
1
0
1
Input and output
unassigned slot
a length byte for inputs follows
a length byte for outputs follows
a length byte each for inputs and outputs follows
Structure of the length bytes:
Octet 2 / 3
Bit
Meaning
7
6
5
4
3
2
1
0
0
...
1
0
...
1
0
...
1
0
...
1
1
...
1
0
...
1
Data length
1 byte or word
...
63 bytes or 63 words
0
Formats
Byte structure
1
Consistency about
Total length
